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Published on: September 18, 2017
Electroencephalography power and coherence changes with age and motor skill development across the first half year of
Ran Xiao1, Joanne Shida-Tokeshi1, Douglas L Vanderbilt2
1Division of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, California, United States of America.
Insights
This study reveals how brain activity, measured by electroencephalography (EEG), changes as infants develop reaching skills. These findings offer insights into early brain development and potential detection of atypical development.
Area of Science:
- Neuroscience
- Developmental Psychology
- Infant Research
Background:
- Previous research linked infant electroencephalography (EEG) to cognitive and motor development after 5 months.
- Understanding early neural changes related to motor skill acquisition is crucial for infant brain development research.
Purpose of the Study:
- To investigate the relationship between EEG measures (power and coherence) and motor skill development in infants younger than 5 months.
- To describe the emergence and changes in specific EEG patterns during early reaching skill development.
Main Methods:
- Longitudinal electroencephalography (EEG) recordings were collected monthly from 21 typically developing infants (38-203 days old).
- Analysis focused on relative power in the 6-9 Hz frequency band and coherence between electrode pairs.
- A total of 71 EEG sessions were analyzed.
Main Results:
- A distinct peak in relative power within the 6-9 Hz band emerged and developed over the first six months of life.
- Coherence increased in bilateral frontal-parietal networks.
- Interhemispheric connectivity in motor cortices showed a general decrease.
Conclusions:
- This pilot study provides a foundational description of neural function changes associated with motor skill development in early infancy.
- Findings suggest experience-dependent plasticity in the infant brain.
- This research may aid in the early detection of atypical infant brain development.
Abstract:
Existing research in infants has correlated electroencephalography (EEG) measures of power and coherence to cognitive development and to locomotor experience, but only in infants older than 5 months of age. Our goal was to explore the relationship between EEG measures of power and coherence and motor skill development in younger infants who are developing reaching skill. Twenty-one infants with typical development between 38 and 203 days of age participated. Longitudinal EEG recording sessions were recorded in monthly increments, with 3-5 sessions acquired for 19 participants and 1 session for 2 participants, resulting in 71 sessions in total. EEG variables of interest were relative power in the 6-9 Hz range and coherence between selected electrode pairs. We describe the development of the peak in relative power in the 6-9 Hz frequency band of EEG; it is not present around 1 month of age and starts to appear across the following months. Coherence generally increased in the bilateral frontal-parietal networks, while the interhemispheric connectivity in motor cortices generally decreased. The results of this relatively small pilot study provide a foundational description of neural function changes observed as motor skills are changing across the first half year of life. This is a first step in understanding experience-dependent plasticity of the infant brain and has the potential to aid in the early detection of atypical brain development.
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